Can gases that are soluble in water be used to create a negative pressure with a hydraulic ejector?
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Dear everyone: There is a reactor available, and this reactor generates ammonia gas during the reaction process. To accelerate the reaction, it is necessary to remove the ammonia gas that is produced during this process. The generated ammonia is prepared to be turned into liquid ammonia. Can a \"hydraulic ejector\" be used to create negative pressure and draw away the ammonia gas generated during the reaction process to the \"liquid ammonia\" synthesis section? During the process of creating negative pressure using a hydraulic ejector to draw away ammonia gas, a large amount of ammonia dissolves in the water, entering the circulation tank of the hydraulic ejector and thus forming ammonia water, rather than liquid ammonia. If a \"hydraulic ejector\" cannot be used in the aforementioned system, what type of vacuum equipment would be more suitable? The pressure during the reaction process is required to be 80 KPa (gauge pressure), which represents a slight negative pressure.
Sure, haha, that’s exactly the principle behind jet vacuum pumps
When concentrating the ammonia solution (containing the product) used in the process, concentration under vacuum by jetting is commonly employed. However, since the ammonia solution often needs to be heated during this concentration process, the ammonia carried by the water in the injector does form an ammonia solution; but due to the high temperature, most of the ammonia molecules evaporate. To recover ammonia, it is necessary to cool the water tank of the circulating injector, which incurs high costs. As a result, the only option left is to recover ammonia by collecting some dilute ammonia solutions.
First of all, it’s important to clarify whether the presence of water will affect normal production; if not, then it’s fine. It will be easy then
First of all, it’s important to clarify whether the presence of water will affect normal production; if not, then it’s fine. It will be easy then
It can generate negative pressure; it can be considered in conjunction with the liquid ammonia section, and care should be taken when using water
It can generate negative pressure; it can be considered in conjunction with the liquid ammonia section, and care should be taken when using water
A device that generates negative pressure by jetting relies on high-speed jets and the condensation of the extracted substance to reduce the density of the gas phase, thereby creating negative pressure. When using such a device, it is necessary to consider not only whether its various parameters meet the requirements but also the physical properties of the fluid being used as well as those of the extracted substance. As you mentioned, ammonia dissolves very easily in water, which is not advantageous in this context. I can suggest several installation methods for you.
To liquefy ammonia, either high pressure or low temperature is required; since you are using a slight negative pressure here, the only option is low temperature. A cooling device is installed in front of the vacuum system for low-temperature liquefaction. The cost might be very high; it’s better to use ammonia solution instead.
General ammonia treatment: 1. It can be combined with sulfuric acid to produce sulfuric anhydride for sale, or 2. it can be converted into 25% industrial ammonia water. It’s not cost-effective to produce it as liquid ammonia! Dealing with waste gas such as ammonia is good enough if it can reduce losses a bit; generally, no profit is made from it